[HOT] next HOT tech chat

Mikel Maron mikel_maron at yahoo.com
Wed Jul 17 07:50:35 UTC 2013


Looks perfect addition to LearnOSM
 
* Mikel Maron * +14152835207 @mikel s:mikelmaron


>________________________________
> From: Nama Budhathoki <namabudhathoki at gmail.com>
>To: Vivien Deparday <vivien.deparday at gmail.com> 
>Cc: "hot at openstreetmap.org" <hot at openstreetmap.org> 
>Sent: Wednesday, July 17, 2013 9:48 AM
>Subject: Re: [HOT] next HOT tech chat
> 
>
>
>Hi Pierre, Vivian, and others,
>
>
>We frequently experience the same problem here in Nepal due to low Internet bandwidth. We have developed a guide to use offline imagery in JOSM. Here is the link:
>
>https://www.dropbox.com/s/3wwpgorjubmp0nc/Using%20offline%20Bing%20Imagery%20in%20JOSM.pdf
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>
>Nama
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>On Wed, Jul 17, 2013 at 10:31 AM, Vivien Deparday <vivien.deparday at gmail.com> wrote:
>
>Hi Pierre,
>>if you are doing your workshop with JOSM, a short term and low-tech solution is to use the caching feature of JOSM. As Paul mentioned, you have to check the terms of use of the imagery you are using to make sure you are allowed to cache it. You can find the feature in JOSM in Edit->Preferences->WMS/TMS tab->Settings. There is a path at the bottom. When you browse around an area, the tiles are cached in this folder, once you have covered the area you want (for each zoom level) then you can copy this folder to the other computers in the right place (check the path in the preferences or you can set the path to where you copied the files). Also, I don't remember exactly but you may also need to do what is written under the section "Caching" on this page http://josm.openstreetmap.de/wiki/Help/Menu/Imagery  to make sure the cache isn't deleted.
>>
>>
>>Cheers,
>>
>>
>>Vivien
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>>
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>>On Tue, Jul 16, 2013 at 12:31 PM, Pierre Béland <pierzenh at yahoo.fr> wrote:
>>
>>HOT is presently deploying four field teams in Burkina Faso, Chad, Togo  and Senegal. As it is often the case in these countries, internet bandwith is a significant problem. We are already experimenting problems in Togo.
>>>
>>>What type of  "not too techy" solution could be implemented immediately to respond to internet communication problems of a classroom with up to 20 computers ?
>>>
>>>As we said yesterday at the Tech WG, the most significative improvement for field teams would probably be to cache the Imagery.
>>>
>>>What short term solution would you propose for this?
>>>
>>> 
>>>Pierre 
>>>
>>>
>>>
>>>
>>>________________________________
>>> De : Harry Wood <mail at harrywood.co.uk>
>>>À : Paul Norman <penorman at mac.com>; 'Yantisa Akhadi' <yantisa at gmail.com>; 'Mikel Maron' <mikel_maron at yahoo.com> 
>>>Cc : "hot at openstreetmap.org" <hot at openstreetmap.org> 
>>>Envoyé le : Mardi 16 juillet 2013 10h39
>>>Objet : Re: [HOT] next HOT tech chat
>>> 
>>>
>>>
>>>
>>>> So, there's a few different things you could cache.
>>>> 
>>>> One is imagery/tiles. For tiles it's a well-solved problem, tile.osm.org
>>>> uses a bunch of squid caches and the configuration is all at
>>>> http://git.osm.org/chef.git/tree/HEAD:/cookbooks/tilecache
>>>> 
>>>
>>>It would be neat if a BRCK type device could intercept requests to tile.openstreetmap.org while an internet connection is working, and then serve the same tiles from cache if the internet is down. I'm thinking of man-in-the-middle caching on the connection device. Is that a squid-like thing to do?  That type of caching may already be a generic function of BRCK. It would mean that if you have some tool running locally, but which is designed to require an internet connection for embedded maps (hitting tile.openstreetmap.org in the standard way) it could carry on working, without re-configuring tile URLs.
>>>
>>>...but it wouldn't have all the tiles in the region. Just those which somebody had viewed before. To have all the tiles, the temptation is to request the full pyramid as a bulk
 tile download. That causes problems for the server, and is strictly disallowed on the main osm tile server, but you could imagine some set-up in which aid workers are allowed to bulk-download a pyramid of tiles from a HOT tile server before they get on a plane.
>>>
>>>Of course the smart way is to run a tile server in the field. Smart because it's more compact, and also because feeding in diffs is a reliable compact thing to do. Another "solved problem" really ...Except that the technology is somehow still far too complicated to give to a random non-technical aid worker. In fact I think even people like MapAction didn't get their heads around it. Rendering is still very much an OpenStreetMap expert skill. 
>>>
>>>It think tiled vector data will be the key to lowering barriers here. You mentioned tiles and API data as two forms of caching, but cached *vector* data has huge potential. This is a bit more of a blue skies idea. But check out this
 tantalising preview from the MapBox guys: https://vine.co/v/b0DvTPnpPtw  That's the whole planet on USB key, rendering on the fly.  I think we want to get to the point where aid workers don't leave home without a copy of this. Then another challenge is allowing them to request low-bandwidth data updates when they have internet. Of course there are some pretty amazing mobile apps which use a tile vector data approach. I really love MapsWithMe, but it's closed-source and doesn't do low-bandwidth updates. Is AND the best open source one? I hope we'll see convergence on an open standard and open tools to view, and update vector tiles. What's the best way for HOT to push things in that direction?
>>>
>>>Harry Wood
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>>> A disadvantage is that they only cache what has been requested.
>>>
>>>
>>>
>>>I think a remote team with sporadic internet
 connection. 
>>>
>>>
>>>on the topic of HOT usb stick.... https://vine.co/v/b0DvTPnpPtw <<< The entire word rendering on the fly!
>>>
>>>
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>>>
>>
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>>
>>
>
>
>-- 
>________________________________________________________________________
>Nama R. Budhathoki, PhD
>Nepal Lead
>The World Bank's Open Data for Resilience Initiative (OpenDRI)
>
>Web: http://budhathoki.wordpress.com
>Skype: namabudhathoki
>Twitter: https://twitter.com/Nama_Budhathoki
>
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